XR1 Pro not compatible with OSSC timings for NESRGB timings, regardless of line mode used.

As the title says, the OSSC with the NESRGB timings (using RGB out for testing) from my Nt Mini Noir gives me a "Not Supported" screen on my XR1 Pro. If I adjust the horizontal sample rate to 340 or 342, I get an image but with columns of shimmering pixels. Is there anything I can do in terms of timings or other settings to get this to work?
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